Telephone



(ModeL) 0. E. BUELL.

' Telephones. No. 232,677. Patented Sept.28,1880.

A 6 22,1705 hr; 6 n fior' NVPE ERS, PHOTO-LITHOGRAPHEH, WASHINGTON n c UNITED STATES PATENT OFFICE.

CHARLES E. BUELL, OF NEW HAVEN, CONNECTICUT.

TELEPHONE.

SPECIFIOATION f0rming part of Letters Patent N0. 232,677, dated September 28, 1880.

Application filed August 31, use (Model) To all whom it may concern Be it known that I, GHARLESE. BUELL, of the city and county of New Haven, State of Connecticut, have invented certain new and useful Improvements in Telephones, of which the following is a specification. I

My invention relates to telephones which respond to sonorous waves or vibrations traversing an electrical conductor.

The object of my invention is to increase the loudness and distinctness of articulation in receiving-telephones.

I would remark that the quality of electro magnetic telephones reverts to the inductive strength and the susceptibility of the magnet, and to the relation of the inducing-magnet to the vibrating armature of such telephones.

As the inductive power of a magnet depends upon the mass when charged to saturation, and as the time required for a magnet to vary in its inductive strength depends largely upon its length, those magnets which are short and heavy possess the qualities necessary for receiving-telephones.

Experiments have demonstrated the fact that the use of avibrating armaturein partial contact with or in inductive proximity to both poles of the inducing-magnet results advantageously, and has led to such usein my invention. Although rectangular steel cores may be advantageously used, I prefer trough-sh aped magnets, which present both polar surfaces to the vibrating armature.

. Figure 1 shows the inducing-magnet A of a telephone, consisting ofa steel core in a trough like form and wound with fine insulated wire, affording a considerable mass of metal with large polar surfaces and but a short length between its polar extremities.

Fig. 2 is a side elevation of the telephone T,- cut away to show the magnet A, shown in Fig. 1, and described in its relation to the vibrating armature e, which is preferably in contact with both poles of the magnet A at the point f, and varying in its inductive proximity to the magnet, as shown, and held in its required normal position by resting upon the containemployment of two armatures in contact or in inductive proximity to both poles of the inducing-magnet A.

The modes of connecting the various parts shown with each other and with the circuit are unnecessary to be described to those skilled in the art.

WVhat I claim as my invention is 1. The combination, in an electrical telephone, of an inductive armature with an inducing-magnet with continuous polarsurfaces in inductive proximity to said armature through out its length or width, substantially as set forth. I.

2. In an electrical telephone, atrough-shaped inducing-magnet arranged to present both its poles to an inductive armature, and with its polar surfaces adjusted or constructed to be in contact with or in closer proximity to the armature at a given portion of its surface than at others, substantially as described.

5. The combination, in an electrical telephone, of two urmatures, each in contact with or in inductive proximity to both poles of an" inducing-magnet, as shown and set forth.

CHARLES E. BUELL.

Witnesses GEO. F. GRAHAM, WM. M. SMITH. 

